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Same problem. Since upgrading to Lollipop this morning this notification has been on there saying there is a system update. But when I click on it, it doesn't do anything. I have wiped cache partition. That didn't help.

This resolved itself after doing another update. It seems like this upgrade took 4 separate upgrades if that makes sense. After the fourth, this notification went away and has stayed away.

Performance of the phone is noticeably reduced since the upgrade, however. Lags a lot. I'm pretty irritated by it. I had a nice phone that I enjoyed very much and paid a lot of money for, and haven't even had it a year yet. Now I have a mediocre one.